Air-pump.



I. PASLEY.

AIR PUMP. I

APPLICATION FILED MAY 20, 1911.

1,003,122, Patentgd Sept. 12,1911.

ITED STATES PATENT OFFICE.

IRA PASLEY, OF OLDS, ALBERTA, CANADA, ASSIGNOR T0 SHARP & SMITH, OF CHICAGO,

. I ILLINOIS, A CORPORATION OF ILLINOIS,

AIR-PUMP.

To all whom it may concern.

Be it known that I, IRA PASLEY, a subject of the King of Great Britain, residing at Olds, in the Province of Alberta and Dominion of Canada, have invented a new and useful Improvement in Air -Pumps, of which the following is a specification.

The object of my invention is to provide a novel construction of pump whereby operating it shall maintain within it a constant pressure of air while being used for spraying and atomizing liquids, such as perfumes, medicinal preparations, hydrocarbons, and the like.

I have more especially devised my pump for use with the device known as a thermocauterizer and commonly employed in veterinary surgery; and I have therefore selected that connection for describing it hereinafter and for illustrating it in the accompanying drawing, in which:

Figure 1 is a view in elevation showing my improved air-pump operatively connected with a thermo-cauterizer, and Fig. 2 is an enlarged view of the pump in sectional elevation.

The pump-cylinder 3 is provided between its ends with a stationary partition 1 containing an orifice provided with an inwardly-opening check-valve 5. A plunger 6 is supported on a spring 7 confined between it and the distal closed end of the cylinder, which may or may not contain openings 8, since the latter perform no operative function. The plunger thus forms with the partition in the cylinder a chamber or reservoir for compressed air, which is provided with a valved discharge-nipple 9. The rear end of the cylinder is closed by a cap 10 having a suitable finger-grip 11 formed upon it; and through a central opening in the cap the piston-rod 12, having a handle, shown as a ring 18, on its outer end, works to actuate the piston 14, which confines a spring 15 between it and the partition.

To operate an ordinary thermo-cauterizer 16 by means of my pump, which is shown connected therewith from the nipple 9 by a hose 17, the operator holds the device at the grip 11 by the fingers of one hand to work Specification of Letters Patent.

Application filed. May 20, 1911.

Patented Sept. 12. 1911.

Serial No. 628,446.

with that hand the piston against the spring 15, while manipulating the device 16 with his other hand, the return stroke of the piston being produced by the spring. Each inward piston-stroke forces air past the check-valve into the chamber, wherein the spring-pressed plunger 6 compresses it and maintains at constant pressure the supply of air forced into it by slowly working the piston while the nipple 9 is open and the device 16 is taking air through it from the supply at that pressure in the chamber, which is easily maintained during the use of that device by slowly working the piston.

The chamber in the present instance operates like a well-known device for the same purpose, in which the second of two connected rubber bulbs, which communicates with a spraying device, is filled with air by working the first bulb to maintain in the second a constant pressure of air for supplying therewith said spraying device. I have devised my improved pump to provide a substitute for the rubber bulbs since the latter readily get out of order and are liable to become punctured and rendered useless when they are most needed, as in the midst of a surgical or other operation, and then leave the operator helpless.

What I claim as new and desire to secure by Letters Patent is-- 1. An air-pump comprising, in combination, a cylinder, a rigid partition immovably secured in the cylinder and a springpressed plunger therein forming with the partition an air-pressure chamber, provided with an outlet, an inwardly-opening checkvalve in the partition, and a piston working in the cylinder against the valve to open it.

2. An air-pump comprising, in combination, a cylinder, a rigid partition immovably secured in the cylinder and a springpressed plunger therein forming with the partition an air-pressure chamber, a valved discharge-nipple leading from said chamber, an inwardly-opening check-valve in the partition, and a piston working in the cylinder against the check-valve to open it and haviing a stem passing through the cylinderhea 3. An air-pump comprising, in combination, a cylinder, a rigid partition immovder-head, a spring confined between said ably secured in the cylinder and a springpartition and piston, and a finger-grip on pressed plunger -therein forming with the the cylinder-head, for the purpose set forth. .10

partition an air-pressure chamber provided IRA PASLEY. I with an outlet, an inwardly-opening check- In the presence of valve in the partition, a piston in the cylin- HUGH GUNN, der with its stem passing through the cylin- DAISY K. DOMINY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

